Apparatus and method for changing the position of a mowing mechanism

US4942724A · kind A · utility

Assignee

• Class OHG · DE

Inventors

• Norbert Diekhans · Gütersloh, DE
• Werner Fitzner · Warendorf, DE
• Heinrich Ostrup · Harsewinkel, DE

Key dates

• Filing date: Mar 9, 1989
• Grant date: Jul 24, 1990
• Expiry date: Mar 9, 2009

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A01D41/141
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A positional regulation of a mowing mechanism is effected in terms of height as a function of a ground pressure signal (SB) and in terms of swiveling in the transverse direction as a function of lateral ground clearance signals (SL, SR), the adjusting signals being carried to hydraulic valves (VT, VH; VL, VR). The goal is to increase the accuracy and freedom from fluctuation in the course of the mowing mechanism cutting height. The ground clearance signals (SL, SR) are used in proportion with the ground pressure signal (SB) for vertical position regulation. A linkage of these signals (SL, SR, SB) with further transducer signals and a method for automatic adaptation of the regulating characteristic by varying the hystereses and idle times of the regulators (V1, V1) is disclosed. The regulating apparatus is used in harvesting and threshing combines when low-height crops are to be mowed and when the ground is bumpy and soft.